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参数资料
| 型号： | PTB48520WAS |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-10 |
| 文件页数： | 2/18页 |
| 文件大小： | 427K |
| 代理商： | PTB48520WAS |
www.ti.com
t 5 ms/div
VOBus (1 V/div)
Q1 Vds (10 V/div)
II (0.5 A/div)
td
Sequenced Power Up with POL Modules
Overview
Auto-Track Features
PTB48520W
SLTS233A–NOVEMBER 2004–REVISED APRIL 2005
and enables the output of the converter. The converter produces a regulated output voltage within 50 ms.
Figure 7 shows the output response of the converter after Q1 is turned on. The turnon of Q1 corresponds to the
drop in the Q1 Vds waveform. Although the output voltage rise time is short (<10 ms), the indicated delay time
(td) varies depending on the input voltage and the module’s internal timing. The output voltage of the module was
set to 3.3 V. The waveforms were measured with 48-Vdc input voltage and a 10-A resistive load.
Figure 7. Output Enable Power-Up Characteristic
The dc/dc converter has two outputs, VO Seq and VO Bus. VO Bus is the main output from the converter. VO Seq
is an output that is derived from VO Bus and can be sequenced with other supply voltages during power up. Both
outputs are regulated to the same set-point voltage, except that the rise in the VO Seq output is controlled by the
pin called Track, and delayed during power-up events. The delay allows the converter to both power and
sequence with one or more non-isolated, 3.3-V input, Auto-Track compatible modules1. The rise of all output
voltages is coordinated using a control signal common to the Track inputs of all Auto-Track compliant modules.
The hold-off delay built into the PTB48520W holds the track control signal low to comply with the power-up
requirements of the downstream non-isolated modules.
Figure 8 shows a block diagram of the converter Auto-Track features. During power up, VO Bus (pin 9) rises
promptly, whenever the converter is connected to a valid input source and its output is enabled. VO Seq (pin 10)
is the Auto-Track compatible output that is derived from VO Bus but controlled by the voltage presented at the
Track input (pin 4). The control relationship is on a volt-for-volt basis, and is active from 0 V up to a voltage just
below the VO Bus output. Between these two limits, the voltage at VO Seq follows that at the Track input. Once
the Track input is at the VO Bus voltage, raising it higher has no further effect. The voltage at VO Seq cannot go
higher than VO Bus, and if connected to +Sense (pin 8), then regulates at the set-point voltage.2
The control relationship between VO Seq and the Track input is the same as other Auto-Track compatible
outputs, across all module types. By connecting the Track input of the converter to the Track inputs of other
Auto-Track modules, all the associated output voltages can be made to follow the same rising control voltage
during power-up transitions.3 A suitable rising voltage is produced by the Track input internal R-C time constant.
An external ramp waveform4, 5 may also be used.
10
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| PTB48530AAS | 功能描述:PTB48530AAS RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:- 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:55V 电压 - 输入（最大）:100V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:200W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-55°C ~ 85°C 效率:* 电源（瓦特）- 最大:* |
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